H - Electricity – 03 – K
Patent
H - Electricity
03
K
328/72
H03K 5/01 (2006.01) H04L 25/49 (2006.01)
Patent
CA 1292520
ABSTRACT The present invention provides an output pulse signal from an input digital signal which can be fabricated in an integrated circuit, and produces an output signal which retains the desired pulse shape unaffected by jitter. In the present invention the pulse shape is formed by using a switched capacitor FIR filter to form the pulse shape (referred to herein as a pulse shaper), and then by controlling the clocking of the digital signals used to operate the pulse shaper to control the timing of different segments. The result is an output signal which has jitter but retains the desired pulse shape. Since a phase corrector which senses jitter can control the clocking, the output pulse shape is unaffected by jitter. The invention can be produced in an integrated circuit since switched capacitor pulse shapers are used, rather than a continuous time filter. An analog pulse signal is produced from an input digital signal by applying the input digital signal to serial shift registers, each spanning less than a baud, operating switched corresponding ones of the shift registers to form different parts of an output signal, summing the output signals in time to form a combined output signal, and low pass filtering the combined output signal to form the analog pulse signal.
567997
Colbeck Roger
Gillingham Peter
Mitel Corporation
Shapiro Cohen
LandOfFree
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